US7120001B2 - Surge voltage protector for use in power transmission networks - Google Patents
Surge voltage protector for use in power transmission networks Download PDFInfo
- Publication number
- US7120001B2 US7120001B2 US10/484,103 US48410304A US7120001B2 US 7120001 B2 US7120001 B2 US 7120001B2 US 48410304 A US48410304 A US 48410304A US 7120001 B2 US7120001 B2 US 7120001B2
- Authority
- US
- United States
- Prior art keywords
- coating
- varistor
- surge arrester
- varistor block
- block
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related, expires
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
- H01C7/12—Overvoltage protection resistors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
- H01C7/12—Overvoltage protection resistors
- H01C7/126—Means for protecting against excessive pressure or for disconnecting in case of failure
Definitions
- the invention relates to a surge arrester for use in power transmission systems, and in particular having a discharge current path which has at least one varistor block, the varistor block having two contact regions and a casing region.
- two or more varistor blocks forming the discharge current path of the surge arrester are arranged one behind the other and are clamped between two end fittings.
- Such surge arresters are used in power transmission systems having differing voltage levels.
- An insulating material housing is arranged between the end fittings so that it surrounds the varistor blocks on the casing side of the casing.
- Nonconductive fibers are wound around the varistor blocks. Internal faults with such varistor blocks can lead to arcs being formed.
- openings are provided between the nonconductive fibers.
- the nonconductive fibers hold the varistor blocks mechanically together so that the fragments formed when the varistor blocks burst in the event of a fault are held together (EP 0 335 480 A2).
- the present invention discloses designing a surge arrester such that the risk of the varistor blocks bursting in the event of a fault is reduced.
- a coating which serves to initiate an electric flashover in the event of a critical temperature of the varistor block being exceeded, is arranged in at least one part region of the casing region of the at least one varistor block.
- the material used for the coating may advantageously be an NTC thermistor material.
- NTC thermistor material reduces its electrical resistance at the critical temperature of the varistor blocks to such an extent that it causes a dielectric breakdown of the arrester path and thus an electric flashover is initiated.
- Such an NTC thermistor material can be produced using the same manufacturing methods as are common for manufacturing varistor blocks, namely sintering and glazing. The application of the coating can therefore be integrated easily in the manufacturing steps common for the production of varistor blocks.
- the coating may alternatively be made for the coating to be formed from a pyrotechnic substance.
- a conductive path of ionized gas is produced.
- This conductive path serves to initiate an electric flashover along the casing region of the varistor block.
- the conductive path immediately produces an arc outside the varistor block.
- Pyrotechnic substances based on nitrocellulose can be applied in a simple manner to the casing region of a varistor block.
- a pasty solution of nitrocellulose in acetone may be used for applying the coating.
- the solvent evaporates after application and the nitrocellulose is fixed sufficiently permanently to the casing surface.
- the ignition temperature of nitrocellulose roughly corresponds to the critical temperature of the varistor blocks, so that the desired external flashover occurs before the varistor blocks are overloaded. Nitrocellulose can also be acquired inexpensively.
- the coating independently of the respectively selected material—extends along a casing line of at least one varistor block.
- the layer may be applied to the outer surface of the varistor blocks or inserted into a groove. If a groove, in which the coating is arranged, is provided in the casing region, it is possible for the coating to be assigned to a varistor block without altering the outer contour of the block.
- a coating which extends along a casing line surrounds each individual varistor block, so that it is ensured that the protective measure takes rapid effect regardless of which varistor block has the fault.
- a layer in the form of a ring may, if necessary, also be combined with a layer running along a casing line.
- An arrangement of the layer in the form of a ring does, however, result in a greater amount of coating material being used. In an extreme case, the entire casing surface of a varistor block may be coated.
- FIG. 1 shows a section through a surge arrester having a layer running along a casing line.
- FIG. 2 shows a section through a surge arrester having two or more layers running in the form of a ring around the discharge current path.
- FIG. 3 shows a view of a single varistor block having a groove.
- the surge arrester 1 illustrated in section in FIG. 1 has a first end fitting 2 and a second end fitting 3 .
- a discharge current path comprising three varistor blocks 4 a, 4 b, 4 c is arranged between the end fittings 2 and 3 .
- a first connection bolt 5 is arranged on the first end fitting and a second connection bolt 6 is arranged on the second end fitting.
- the three varistor blocks 4 a, 4 b, 4 c are braced with insulating rods 7 for mechanical stabilization purposes.
- the surge arrester 1 has an insulating material housing 8 .
- a coating 9 of a material which serves to initiate an electric flashover in the event of a critical temperature of the varistor blocks being exceeded, is arranged along a casing line of the varistor blocks 4 a, 4 b, 4 c.
- the coating 9 may be made of, for example, an NTC thermistor material or a pyrotechnic substance. The way in which the coating 9 works is described by way of example using an embodiment of the layer as a pyrotechnic coating.
- the varistor blocks are heated owing to a fault current flowing through the discharge current path.
- a critical temperature of approximately 200° C. the coating 9 is ignited and ionized gas is produced.
- This ionized gas then forms a conductive path between the first end fitting and the second end fitting.
- An arc forms immediately, owing to the high potential difference between the two end fittings.
- This arc burns outside the varistor blocks 4 a, 4 b, 4 c, which prevents a flashover within the varistor blocks 4 a, 4 b, 4 c.
- the excess gas pressure produced by the burning arc inside the surge arrester 1 can be dissipated by the insulating material housing 8 bursting open in a corresponding manner.
- the surge arrester 1 a as shown in FIG. 2 has in principle the same construction as the surge arrester 1 illustrated in FIG. 1 .
- the coatings 9 a, 9 b, 9 c are merely arranged on the varistor blocks 4 a, 4 b, 4 c in the form of a ring around the circumference.
- the pyrotechnic substance may be applied in various ways. As already mentioned, the pyrotechnic substance may be used in the form of a pasty solution. In the present case, the pyrotechnic substance [lacuna] wound onto the respective varistor block in the form of a strip-like structure.
- a single varistor block 4 d is provided with a groove 10 along a casing line.
- This groove can be filled with the material which serves to initiate an electric flashover in the event of a critical temperature being exceeded.
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermistors And Varistors (AREA)
- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
Description
Claims (7)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10136617.5 | 2001-07-17 | ||
DE10136617A DE10136617C1 (en) | 2001-07-17 | 2001-07-17 | Surge arrester for use in power transmission networks comprises several varistor blocks which have coating which initiates arc-over when its temperature exceeds preset value |
PCT/DE2002/002636 WO2003009310A2 (en) | 2001-07-17 | 2002-07-16 | Surge voltage protector for use in power transmission networks |
Publications (2)
Publication Number | Publication Date |
---|---|
US20040207969A1 US20040207969A1 (en) | 2004-10-21 |
US7120001B2 true US7120001B2 (en) | 2006-10-10 |
Family
ID=7693294
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/484,103 Expired - Fee Related US7120001B2 (en) | 2001-07-17 | 2002-07-16 | Surge voltage protector for use in power transmission networks |
Country Status (8)
Country | Link |
---|---|
US (1) | US7120001B2 (en) |
EP (1) | EP1410407B1 (en) |
JP (1) | JP2004535683A (en) |
CN (1) | CN1326161C (en) |
BR (1) | BRPI0211168B1 (en) |
DE (2) | DE10136617C1 (en) |
RU (1) | RU2292096C2 (en) |
WO (1) | WO2003009310A2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100973058B1 (en) * | 2008-04-23 | 2010-07-29 | 한국세라믹기술원 | Composite chip device of thermistor-varistor and manufacturing method thereof |
US11232920B2 (en) * | 2017-12-04 | 2022-01-25 | Siemens Aktiengesellschaft | Arrangement and method for switching high voltages having a switching device and precisely one resistor stack |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10146947C5 (en) * | 2001-09-24 | 2009-10-08 | Epcos Ag | Electrical component |
SI23040B (en) * | 2009-04-29 | 2018-06-29 | Crdce D.O.O. | Varistor with defined weak spot within its structure |
DE102009053145A1 (en) * | 2009-11-05 | 2011-05-12 | Phoenix Contact Gmbh & Co. Kg | Overvoltage protection device, has thermal expandable material arranged within housing such that pole of varistor does not stay in electrically conductive contact with connection elements |
RU2705203C1 (en) * | 2016-09-28 | 2019-11-06 | Абб Швайц Аг | Pulse discharger and method of its manufacturing |
EP3505943B1 (en) * | 2017-12-29 | 2020-05-20 | Siemens Aktiengesellschaft | Detection of an electrical overvoltage |
CN112071534A (en) * | 2020-09-03 | 2020-12-11 | 合肥众甫工业技术有限公司 | Overvoltage protector based on corrugated pipe buffering assembly |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4656555A (en) | 1984-12-14 | 1987-04-07 | Harvey Hubbell Incorporated | Filament wrapped electrical assemblies and method of making same |
US4700169A (en) * | 1984-03-29 | 1987-10-13 | Kabushiki Kaisha Toshiba | Zinc oxide varistor and method of making it |
EP0335480A2 (en) | 1988-03-31 | 1989-10-04 | Hubbell Incorporated | Modular electrical assemblies with pressure relief |
US5145516A (en) * | 1987-03-04 | 1992-09-08 | Pendar Industries | Composition for coating electrodes of a surge arrester |
US5565838A (en) * | 1992-05-28 | 1996-10-15 | Avx Corporation | Varistors with sputtered terminations |
US5721664A (en) * | 1996-12-16 | 1998-02-24 | Raychem Corporation | Surge arrester |
US6392861B1 (en) * | 1999-09-15 | 2002-05-21 | Joslyn Manufacturing Co. | Surge arrester having disconnector housed by mounting bracket and end cap |
US6614640B2 (en) * | 2000-01-10 | 2003-09-02 | Abb Schweiz Ag | Surge arrester |
US6778374B2 (en) * | 2002-01-04 | 2004-08-17 | Hubbell Incorporated | Reinforced arrester housing |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1046589C (en) * | 1995-01-24 | 1999-11-17 | 深圳宝安银星电力电子公司 | Metal oxide lightning arrester |
-
2001
- 2001-07-17 DE DE10136617A patent/DE10136617C1/en not_active Expired - Fee Related
-
2002
- 2002-07-16 EP EP02753027A patent/EP1410407B1/en not_active Expired - Lifetime
- 2002-07-16 CN CNB028119819A patent/CN1326161C/en not_active Expired - Fee Related
- 2002-07-16 DE DE50203021T patent/DE50203021D1/en not_active Expired - Lifetime
- 2002-07-16 BR BRPI0211168A patent/BRPI0211168B1/en not_active IP Right Cessation
- 2002-07-16 RU RU2004104458/09A patent/RU2292096C2/en not_active IP Right Cessation
- 2002-07-16 WO PCT/DE2002/002636 patent/WO2003009310A2/en active IP Right Grant
- 2002-07-16 US US10/484,103 patent/US7120001B2/en not_active Expired - Fee Related
- 2002-07-16 JP JP2003514567A patent/JP2004535683A/en active Pending
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4700169A (en) * | 1984-03-29 | 1987-10-13 | Kabushiki Kaisha Toshiba | Zinc oxide varistor and method of making it |
US4656555A (en) | 1984-12-14 | 1987-04-07 | Harvey Hubbell Incorporated | Filament wrapped electrical assemblies and method of making same |
US5145516A (en) * | 1987-03-04 | 1992-09-08 | Pendar Industries | Composition for coating electrodes of a surge arrester |
EP0335480A2 (en) | 1988-03-31 | 1989-10-04 | Hubbell Incorporated | Modular electrical assemblies with pressure relief |
US5565838A (en) * | 1992-05-28 | 1996-10-15 | Avx Corporation | Varistors with sputtered terminations |
US5721664A (en) * | 1996-12-16 | 1998-02-24 | Raychem Corporation | Surge arrester |
US6392861B1 (en) * | 1999-09-15 | 2002-05-21 | Joslyn Manufacturing Co. | Surge arrester having disconnector housed by mounting bracket and end cap |
US6614640B2 (en) * | 2000-01-10 | 2003-09-02 | Abb Schweiz Ag | Surge arrester |
US6778374B2 (en) * | 2002-01-04 | 2004-08-17 | Hubbell Incorporated | Reinforced arrester housing |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100973058B1 (en) * | 2008-04-23 | 2010-07-29 | 한국세라믹기술원 | Composite chip device of thermistor-varistor and manufacturing method thereof |
US11232920B2 (en) * | 2017-12-04 | 2022-01-25 | Siemens Aktiengesellschaft | Arrangement and method for switching high voltages having a switching device and precisely one resistor stack |
Also Published As
Publication number | Publication date |
---|---|
EP1410407B1 (en) | 2005-05-04 |
CN1528001A (en) | 2004-09-08 |
WO2003009310A2 (en) | 2003-01-30 |
RU2292096C2 (en) | 2007-01-20 |
DE10136617C1 (en) | 2002-10-10 |
US20040207969A1 (en) | 2004-10-21 |
RU2004104458A (en) | 2005-07-10 |
EP1410407A2 (en) | 2004-04-21 |
JP2004535683A (en) | 2004-11-25 |
BRPI0211168B1 (en) | 2016-01-05 |
WO2003009310A3 (en) | 2003-08-07 |
DE50203021D1 (en) | 2005-06-09 |
BR0211168A (en) | 2004-08-10 |
CN1326161C (en) | 2007-07-11 |
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Legal Events
Date | Code | Title | Description |
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AS | Assignment |
Owner name: SIEMENS AKTIENGESELLSCHAFT, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KRUSKA, BERND;STEINFELD, KAI;REEL/FRAME:015501/0301 Effective date: 20031202 |
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Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
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FPAY | Fee payment |
Year of fee payment: 4 |
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FPAY | Fee payment |
Year of fee payment: 8 |
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FEPP | Fee payment procedure |
Free format text: MAINTENANCE FEE REMINDER MAILED (ORIGINAL EVENT CODE: REM.) |
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LAPS | Lapse for failure to pay maintenance fees |
Free format text: PATENT EXPIRED FOR FAILURE TO PAY MAINTENANCE FEES (ORIGINAL EVENT CODE: EXP.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
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STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20181010 |